Hi Samir,
KE4MS is used in similar kind of requirements like yours. What the system does is, it used another Value Field to store one Single UOM. While posting the system will check for such UOM Conversion in the Material Master and then post.
If you are going to use KE4MS then you need to add another Quantity Field and then regenerate the Operating Concern.
Using of KE4S is your choice based on the data you have in your system. if it is less go ahead, but if it more...i would prefer not to use it.
Best Regards
Surya Varma